LG XBOOM Go PL2 Compatible Battery 3.7V 1500mAh

LG XBOOM Go PL2 / PJ3 / PJ9 — 3.7V Li-Polymer Replacement Battery (EAC63558701)

This 3.7V, 1500mAh Li-Polymer cell replaces part number EAC63558701 in the LG XBOOM Go PL2, PJ3, PJ9, and related compact Bluetooth speakers. It restores the wireless audio function when the original cell no longer holds a charge or fails to power the speaker on. Dimensions are 56.00 × 34.46 × 6.70mm — check yours before ordering if you are unsure of the model variant.

• PL2 / PJ3 / PJ9 shared platform: These models run the same 3.7V Li-Polymer cell on a common power rail with an identical connector pinout and BMS handshake, which is why a single replacement covers the full range.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the PL2 platform. The onboard BMS accepted charge without fault codes, voltage held steady across the amplifier draw range, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge calibration for daily-use speakers: If you use the PL2 plugged in most of the time, let the battery run down below 20% at least once a month before recharging. Constant top-off charging without a full discharge cycle causes the fuel gauge to drift, making the battery indicator unreliable and accelerating capacity fade on Li-Polymer cells.

Audio distortion before the battery indicator reaches empty on the PL2

As a Li-Polymer cell ages, its internal resistance rises. Under amplifier load — especially at higher volume levels — the cell voltage sags below the threshold the amplifier needs to operate cleanly. The speaker clips the audio signal before the low-battery indicator triggers because the protection circuit threshold is set lower than the amplifier's clean-operating floor. Replacing the cell restores the voltage headroom the amp needs. After fitting the new battery, run it through one full charge before extended use to let the BMS establish an accurate capacity baseline.

PL2 won't wake from USB-C after sitting unused for weeks

Li-Polymer cells self-discharge during storage. If the PL2 sits unused long enough, the cell drops below the minimum voltage USB-C PD will accept — typically around 2.5V — and the charger refuses to negotiate a session. The BMS is protecting the cell from an unsafe charge rate at that voltage. To recover a deeply discharged original cell, some chargers offer a trickle-charge mode, but a cell that has reached this state repeatedly will have lost measurable capacity. If the speaker won't respond to USB-C after storage, check the cell voltage with a multimeter at the battery terminals — anything below 2.8V on a 3.7V nominal cell is a strong indicator the pack needs replacement.